Carburetor nozzle



Feb. 18, 1930. H. w. Hess CARBURETOR NOZZLE Filed June 6, 1927 INVENTOR.'

Patented Feb. 18, 1,930

f` UNITED STATES" HARRY w. nnss, oFLos ANGELES, CALIFORNIA oARBUR-E'ron NozzLn Application inea June e, v19a?. serial No. 196,921.V

This invention relates to improvements in corburetor nozzles, sometimes termed aspirating tubes or nozzles.

The invention has for an object the provision of an aspirating tube adapted to give a correct proportion of air to gasoline throughout the entire speed range of the motor, and whereby one is able to secure the desired idling period of the motor without 1o loading the said motor.

Another object is the provision of an aspirating tube which is simple of construction, easily installed in existing carburetors, and which will render the said carburetors more la' efficient and satisfactory.

i Other objects include the provision of an aspirating tube for carburetors which will allow an internal combustion motor with which said carburetor is associated to operate 20 more perfectly and with a minimum of gasoline consumption, thus lowering the operating cost of said motor.

Other objects include simplicity of construction, foolproofness in operation, and general superiority and efficiency in useand service. K

With the above and lother objects in view,

the invention consists in the novel and useful provision, formation, construction, association and relative arrangement of parts, members and features, allas shown in a certain embodiment in the accompanying drawing, described generally, and more particularly pointed out in the claims.

c5 In the drawing:

Fig. l is a fragmentary and vertical sectional view of a carburetor embodying the improved invention;

Fig. 2 is a vertical sectional view of the k40 improved aspirating tube for the carburetor;

Fig. 3 is a cross-sectional view on the line 3-3 of Fig. 2;

Fig. 4 is an enlarged cross-sectional view of the metering valve head and seat member the aspirating tube being in section on the line 4 4 of Fig. 3; and

Fig. 5 is a vertical sectional view of the metering valve head and seat member, the aspirating tube being shown in section on the line 5 5 of Fig. 3.

Corresponding parts in all the figures kare designated by the same reference characters.

Referring now with particularityto the drawing, the aspirating tube nozzle will be first described followed by a description of its relation relative to other parts of the carburetor.

The aspirating tube is shown in vertical section in Fig. 2, and the same is designated as an entirety by A. The said member inso"V cludes first and secondV tubular Vmembers ai and b, concentrically arranged with the periphery of the tube-b spaced slightly from the inner surface of the tube a.' Both tubes are formed with bell'ends, or mouths, land G5 2 respectively. The tube Zi 'does not extend throughout the length of the tube a in the present embodiment of the invention, although it might do lso under certain operative A conditions. The tube b is providedwith a basefmemberV 3, secured within the tube a; y In the present instance it will be seen that the bellmouth or end 2 of the ltube b'extends slightly beyond the confines ofthe bell mouth l of the tube a. What may be termedfan i expansion chamber 4 is provided as between the base 3, and the inner confines of the tube a. The base 3 is provided withone or more orifices 5, permitting communication between the annular space'included between the tubes 80- a and and the expansion chamber 4. Furtheremore, one or more orifices 6 and 7 extend radially through the tubes a and b, and which orifices may or'may not be in alignment. It Willbe noted that the orifices 6 and 7 are 85 above thebase 3, and that the orifices 6 comf municate with the annular space between the tubes a and while'the orifices 7, if more than oneis used, extend between the annular space included between the tubes a and b and the interior of the tube-b.' `It will be noted that the'base 3 closes the bottom portion of the tube Z), wherebythe tubel has no-direct communication with the expansionchamber 4, other than by way of the orifices 5 and 7 95 -In order to make this'particular aspirating tube adaptable to dierent carburetors,-I have provided. a peripheral flange 8 `on* the tube a. Y Y 1 As vshowing the adaptation of the present aspirating tube to a carburetor such as is used on the Hudson motor cars, the said carburetor includes the usual seat member 9, for a metering valve head 10. This metering valve head is provided with one or more primary air passages l1, and the said head is screwthreaded toa metering valve stem 12, as

shownV at .13.*v .This metering valve stem is provided with a longitudinal orifice, called the fuel metering orifice, V14, and fuel is permitted to pass througlrsaid metering ori'- fice 14 under control of a metering pin 15. The aspirating tube or nozzle is locked asbetWeen the end of the meteringfvalye stern and the metering valve head, when the metering valve head is screwthreadedtof thev stem. It will-` benoted that thev bell ends of the tubes @and Z) extend into a coniealopening 16 in the metering valve head, and that the prirnary airl passages llf termi-nate in one in stance adjacent the orifices 6 ofthe tube a. It is, of course, understood that the air inlet would communicate with the chamber Y? to .supply airtoY the primary air passages 11.

The various uses andadvantages of this aspira'tingube area-'s follows:

This tube involves the principle of dual viscosity as related) to the passage of air, one passage of air passing around the outside ofthe tube a, While a second passage of air passes through the orificesl 6 insa-id outer tubelar, andthroughthe orifices 7 in the tube 17, The gaseous fluid is allowed to vexpand in the expansion chamber 4, to give anl equall dis'- tribution of this expanded fluid before such gaseous fluid is permitted to pass through the orifices. In the presentinstance the orifices 5' are equijdistantly spaced, so that aviscosity isassured asbetween said gaseous iiui'd and the twoA streams of ai-r, which experiment has indicated gives a correct proportion of air to gas throughout the entire' speed range of the motor.

It, obvious that various changes andk z modiflcations maybe madein practising the invention in departure from the particular showing; Without departing from` the true spirit of the invention A f HavingsthusI disclosedy my invention, I claim and desireito secure by Letters Patent: y Anozzl'e device for carburetors compris* ing a tubularibody having an exterior iange end an interior tubular' member provided witha- Abottom Wall 'ha-ving p'erforations; and

formingfa fuelqexpansion ,chamber at the lower endofthe nozzle, said tubularfbody and said, interior tubular member feachthaving radially. disposed *openings located in the same planeandin registering relation and saiidgradial openings` being located` in staggeredl relation tosaidperforations in the'bot'- tom-wall ofthe tubular member. v fIntestimon'y whereof, I have signed my name to this specication. f v i HARRY W. HESS. 

